Electric pump-governor.



P. L. CRITTENDEN.

ELECTRIC PUMP GOVERNOR.

APPLICATION FILED AUG-5. 1915.

1,224,147. Patented Mayl, 1917.

r mwms PEYERS 6a.. PHom-Llndm, WASHINGYUN, n c.

PATENT onnron.

PHILIP I. CRITTENDEN, OF EDGEWOOD, PENNSYLVANIA, ASSIGNOR TO THE WESTING- HOUSE AIR BRAKE COMPANY, BF 'WILIVIERDING, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

ELECTRIC PUMP-GOVERNOR.

Specification of Letters Patent.

Patented May 1, 1917.

To all whom it may concern:

Be it known that I, PHILIP L. Cnrr'rEN- mm, a citizen of the United States, residing at Edgewood, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Electric Pump-Governors, of which the following is aspecification.

This invention relates to electric pump governors for controlling the circuit of the motor which drives the pump.

The principal object of the invention is to eliminate the flexible connection or pig tail usually employed in connection with electric pump governors for completing the circuit to the movable part of the switch where the circuit is made and broken at a single contact point.

In the accompanying drawing, the single figure is a sectional view of the switch portion of an electric pump governor with my improvement applied thereto.

As shown in the drawing, the pump governor switch portion may comprise a piston 1 contained in a casing 2 and operated by fluid under pressure for opening switch contacts for controlling the pump motor circuit and by a spring 3 for closing the contacts.

The piston stem 4, connected to piston 1, carries a contact arm 5 having pivoted to one side a contact member 6 adapted to have a rolling and sliding engagement with a stationary contact member 7 On the opposite side, the contact arm 5 is provided with a sliding contact member 8 which is adapted to constantly engage a stationary contact member 9.

In operation, when fluid under pressure is admitted to the under side of piston 1, by the usual operation of the pump governor, to stop the pump, the upward movement of the piston causes the contact member 6 to roll and slide on the stationary contact 7, engagement being maintained by a spring 10 until shoulder 11 of the member 6 engages abutment 12 of the arm 5 and then the member 6 separates from the contact 7 so as to open the motor circuit.

During this movement, the contact member 8 remains in engagement with the stationary contact 9, the same having a constant sliding connection with the stationary contact 9.

When fluid under pressure is released from the under side of piston 1, the spring 3 operates to move the piston 1 downwardly and thereby cause the contact member 6 to engage the stationary member 7, the member 6 having a sliding and rolling movement on the contact 7 until the parts assume the full cutin position shown in the drawing.

In this movement, the contact member 8 slides on the stationary contact member 9, to maintain connection on this side of the switch.

It will now be seen that by means of the present construction, the necessity for providing a flexible connection to the moving contact member is obviated, and likewise the possibility of breaking the connection by. constant flexing as the switch moves in and out.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

In an electric pump governor, the combination with a fixed contact member, a movable arm carrying a contact member for making and breaking the pump motor cirouit at the fixed contact member, of a second fixed contact member and a sliding contact member carried by said arm and having an extended contact face adapted to constantly engage the second fixed contact member through the movement of the sliding contact.

In testimony whereof I have hereunto set my hand.

PHILIP L. ORITTENDEN. Witnesses:

A. M. CLEMENTS, S. W. KEEPER.

Gopie: of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

